Clock



FIG. 1 is a perspective view taken from the front, top and left side ofa clock showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a rear elevational view thereof; and

FIG. 5 is a right side elevational view thereof.

The ornamental design for a clock, substantially as shown and described.